The repair market jobs for the old nostalgic equipment usually requires old nostalgic equipment technicians with decades of experience,
sadly.
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I still work on tube gear in old semi production tools but it's odd-duck type stuff around high voltage that can put a hurt on you in a nanosecond..
https://forum.allaboutcircuits.com/threads/vom-vs-dmm.193958/post-1823736
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https://forum.allaboutcircuits.com/threads/tube-creep.113198/post-880679

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I took a one semester class on tubes in college, but I don't have the experience you are talking about.
I also tested tubes and replaced them, but never got into actual repair of the circuits except for what I learned in the class.

Question:
How do the newer SMD circuit devices deal with the applications of big devices that the old HV and high ampere gear operated?
Those old HV devices must still be useful and needed even today. What replaced those big tubes and peripheral components
like big capacitors and big output transformers?

 

Sounds like you are about my age or even a bit older. Unfortunately, companies (pretty much of any size) that are going to hire someone with minimal skills are probably looking at doing so as an investment in what you can learn and eventually become to them. That means that they are looking for someone pretty new and fresh that just currently lacks the experience -- and hence is going to be paid accordingly. They aren't looking for someone our age, who will (rightly or wrongly) be viewed as someone that is unlikely to grow beyond what they bring to the table to begin with.

My guess is that, if you do find someone willing to hire you, it will be a small house that is looking for someone to do what is the equivalent of electronics manual labor for very low pay. The good news is that those kinds of employers are usually more more willing to let you grow into whatever level of work you are capable of even if they didn't expect it to happen.

How would a job like you describe there, in a house like that be titled in the Job Description? What title to look for?

Thanks

 

How would a job like you describe there, in a house like that be titled in the Job Description? What title to look for?

Thanks

Who knows? Companies, especially small companies, make up their own job titles and descriptions to best suit their needs. One company might call it "technician", but another company that has a job called "technician" might mean something very different. Some might call it "lab assistant". Some might call it "assembler".